Spooky http://en.wikipedia.org/wiki/Cisco_PIX
Some Intel-based Ethernet cards for the PIX are identified at boot with the designation "mcwa". This designation denotes a multicast <http://en.wikipedia.org/wiki/IP_multicast> receive bug <http://en.wikipedia.org/wiki/Software_bug> in the card's firmware that the designers addressed with a feature they called *M*ulti *C*ast *W*ork *A*round.
...I've seen this happen with 1 fxp card I used to have, I don't know if this was a recycled PIX part or not. Think it was 82559ED off the top of my head.
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